Method of manufacturing duplex bags



0ct.2l, 1941. c. KIMPLE v METHOD OF MANUFACTURING DUPLEX BAGS 3 Sheets-Sheet 1 I Original Filed lay 5; 1939 I INVENTOR lagfe 6.21. z 227 Ze, %//4W Z v A Zazuze Oct. 21, 1941. 1.. c. KIMPLE METHOD OF MANUFACTURING DUPLEX BAGS Original Filed May 5, 1 959 3 Sheets-Sheet. 2

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Oct. 21, 1941. c. 'KIMPLE METHOD OF MANUFACTURING DUPLEX BAGS" Original Filed May 5, 1939 s Sheets-Sheet s INVENTOR.

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Patented Oct. 21, 1941 I I Q 2 UNITED STATES. PATENT OFFICE 2,259,752 METHOD or MANUFACTURING nurmsx mes Louie C. Kimple, Dallas, Tex., assignor to Dixie Wax Paper Company,'Dallas, Ten, a corporation of Texas Original application May 5, 1939, Serial No.

272,002. Divided and this application November 27, 1940, Serial No. 367,466

4 Claims. (Cl. 9335) The present invention relates to the manufac Fig. 1 is a side elevation of the attachment emture of paper bags and more particularly, duplex bodying the present invention as connected to a bags formed from sheets of glassine or other conventional type-of bag forming machine known fragile material. as a Matador machine and the latter being Duplex bags usually consist of two or more 5 fragmentarily and diagrammatically illustrated.

, layers of material formed into an outer and a Fig. 2 is a detail side elevation of the notching corresponding inner tube, both of which are or perforating device of this attachment. closed at one'end to form the bottom of the bag g. 3 illustrates diagrammatically in end eleand fiiese tubes may be of thesame material or vation the several types of cams employed for v of difierent materials, as condition or preference intermittently actuating the notching or perforatmay dictate. However, when desiring to increase hlg cethe moisture-vapor-proofness of bags made from Fig. 4 illustrates in side elevation a slightly Wax coated papers, the bags are doubled, thereby modified form of the attachment for preparing having a two-fold thickness of the same wax the webs from which duplex bags are formed as coated material, but in producing such duplex connected to another conventional type of bag bags, ,their usefulness has heretobefore been forming machine known as the Potdevin magreatly decreased by failing to efi'ect the proper chine and the latter being fragmentarily illusseal at the bottoms of the bags so formed and, trated.

therefore, it is an object of the present invention Fig. 5 is a detail side elevation of the rotary to provide a duplex bag in which the sections cutting or notching blade and driven shaft thereof are separately formed having a single therefor.

sealing line at the bottom thereof for jointly Fig. 6 is a side elevation of the stationary connecting the sections together, thereby greatly notched cylinder which coop es W h the rotary improving the moisture-vapor-proofness of the cutting blade as illustrated in Fig. 5-

formed bag and further perfecting a-permanent Fig. illustrates diag m y i p p and economical seal at the bottom of the bag. elev on two superimposed sheets of paper after Another object of the present invention is to y h ye b n. prepared by the attachment and provide a simple method of forming duplex bags illustrating the course of travel of these sheets upon most any conventional bag making or formfrom the time they leave the attachment until ing machine in rapid succession from sheets of y are formed o tubes y e b g making material and in a continuous manner. m h ne.

A further object of the present invention is to 3 s a lpe spective' view of one end provide an attachment for conventional bag make Of a bag length e ered om the rmed t e. ing machines which will automatically and efliwhich when Sealed provides a bottom end of the ciently preparesheets of material prior to enterba 1 ing the bag machine where such sheets of ma- Fig. 9 is a detail transverse section throu h 1 terial may be formed into duplex bags without the b ttom or tail end of a formed bag, and in any manner altering the construction of the 10 is a P pe e View o a ed duplex bag forming machine or interfering with the norbag when in an p pos on. mal operation thereof. 40 The attachment as illustrated in Figs. 1, 2 and A further object of thepresent invention is to 3 t drawings m y be connected to a bag provide an attachment of the above character maklhg f g mach ne k gown to the trade which when o c applied t a bag forming as a Matador machine, whic latter comprises chine through a simple adjustment of 9. frame I having supported thereupon the usual tain parts of the attachment, permit different former 2 and the dividers 3. In the manufacsized bags to be formed, as required: tllre 0f duplex bags. o or e mposite sheets Other objects of the invention will be in part Of P p e wn t r ugh the machine Where obvious and in part pointed out hereinafter. the marginal edges of the S e s are first sep- In .order that the invention and its mode of arated fr each 0the! y e ns of the dividers operation may be readily understood by persons 3 nd then folded-or formed into tubes by means skilled in the art, I have in the accompanying of the former Before entering t e ag ormdrawings and in the detailed following descripmachine, Paste is pplied to the sheets and tion based thereupon, set out an embodiment of after the tubes are formed, the marginal edges of the same. the sheets are united and sealed together in th In the drawings: usual manner upon the bag machine, thereby tablishing the usual back or longitudinal seam of the bag. The so formed tubes are then out into predetermined bag lengths by a rotary cutting blade which travels through the knife guard 4. At each end of the severed tubes 8. flap is formed and one of these flaps is used for closing the bottom of the bag. It is to this latter type of bag forming or making machine the attachment is applied, whereby the sheets of paper are supported and prepared prior to their delivery to the bag forming machine, in order that the latter may produce from such sheetsduplex bags in a more efficient and economical manner.

The attachment consists of a supporting frame 5 having removably mounted thereupon a storage roll of paper 6 from which the outer tube or section of the bag is formed and, also, a

second roll of paper I is supported by the frame I B from which the inner or liner tube or section of the bag is formed. The web or sheet of paper 8, as it leaves the roll 8,'flrst passes over the guide rolls 9 to a roller ill. The liner sheet or web II from the roll 1 passes over the guide roll l2 and a platen cylinder l3 and from this platen cylinder l3 over a guide roller l4 where this sheet of paper i I meets with the sheet I as the latter leaves the roller Ill.

Supported by the frame I is a paste pot I! having an adhesive applying roller I mounted therein for transferring the paste or other adhesive within the pot ii to one face of the paper web 8 as the same passes over the roller II and as the webs or sheets of paper I and H are brought into direct contact with one another as they leave the roller III, a portion of the paste so applied toone face of the sheet I will be transferred by adhesion to the opposed face of the sheet The two sheets or webs of paper. while travelling in direct contact with one another,

pass below a guide pulley I! where the two sheets 4 of paper are forced into direct contact with one another and from this guide pulley H, .the sheets or webs of paper are delivered to the bag forming machine. As the sheets leave the roller ll, they travel as a single sheet in superimposed relation, where a part of the adhesive is transferred to the lower side of the liner sheet. 0n approaching the former 2, the marginal edges of the sheets are separated by the-dividing fingers 2. The opposite edges of both the outer sheet and the liner sheet are tucked between the adhesive coated edges, thus giving a'glued seam to both the inner and outer tubeof the bag. These two tubes are not connected together by these glued seems but are telescopically arranged one within the other.

The platen cylinder I3 is journalled within suitable bearings carried by a floating frame I4, which latter has one end pivotally connected as at l9 to the frame 5 of the attachment. whereas, the opposite or free 'end of this frame I. has joumalled within suitable bearings mounted thereupon a roller 20. Also journalled in suitable bearings carried by the frame I is a shaft having keyed thereto a cam 2| and as this cam rotates, the roller 20 rides upon the outer periphery thereof, whereby, due to the depression 22 formed within this cam, the floating frame is may swing upon its pivoted connection I! with the frame 5. I Y

The platen cylinder I! has a plurality of grooves 23 formed adjacent its medial portion capable ,of receiving the teeth or notches of a blade 24. This blade 24 is removably connected to the frame 5 of the attachment in order that blades of different lengths may be substituted therefor, corresponding to the width or the paper bag being formed. The liner sheet or web of paper Ii may freely pass over the cylinder I! but as the roller 20 registers with the depression 22 of the cam, the cylinder l2 will cause the liner sheet to engage the teeth or notches of the blade 24, whereby. a row of perforations or notches is formed in the liner sheet.

The shaft upon which is mounted the cam 2| is driven by means of a sprocket wheel 25 over which passes. a sprocket chain 28. The breaker mechanism of the bag making machine which actuates the rotary cutting blade and which latter passes through the knife guard 4, comprises a driven shaft 21, and over a sprocket wheel connected to this shaft 21 passes a sprocket chain 28. This sprocket chain 20 also passes over a sprocket wheel 28 and to the latter is operative- 1y connected the sprocket chain 26, whereby upon each revolution of the shaft 21, the cam 2|.

will be caused to make a complete revolution. The rotary cutting blade upon each revolution of the shaft 21 levers the paper tubes into bag lengths and as the row of perforations formed by the cutting blade 24 should register with the tail flap of the bag, a row of these perforations.

is formed within the liner sheet at the proper spaced points therein. From the foregoing, it is quite obvious that a continuous drive is effected between the breaker or cutting mechanism that forms the tubes into bag lengths and the cam 2|, in order that the sheets or webs of paper may pass in a continuous manner through the bag forming machine. In Fig. 3 of the drawings, I have illustrated diagrammatically the lengths of the depression within several types of cams employed for producing bags of different lengths. When producing bags-of a short length. a large depression is formedwithin the cam but as the length of the bags is increased, these depressions are diminished in size, in order that the perforations formed within the liner sheet may be of the proper size for all bag lengths.

The liner sheet II, as it travels over the revolving cylinder, is, at certain predetermined intervals or when the roller 20 registers with a depression 22, formed within the cam 2| brought into engagement with the stator knife or blade 24 where the latter tears or perforates the sheet with a row of elongated slots 30. However, the sheet ii is brought into engagement with the blade only for a period of time sufficient to effect a slot or tear in proper relation to the bottom or tail flap of the bag and in the proper longitudinal proportion thereto. The length of these slots 20 is regulated by means of the cams 2| and the deeper the engagement of the notches of the blade 24 with the grooves 23 of the cylinder ll, the longer the slot or tear will be in the liner sheet. The rotation of the cam 2| is timed with the breaker arm or cutting blade that cuts the web into bag lengths so that no change in gearing is required. The length of the bag is gov- ,erned by a variable speed mechanism that drives to the length of the bag. The severed or torn portions 3| of the liner sheet are folded back thereupon by the notches formed with the blade 24 as the sheet leaves the same. The number or spacing of these slots 30 is governed by means of the notches formed with the blade 24, but preferably, these slots should be arranged in rows which extend throughout the width of the bag.

The paste or other adhesive is applied to one face of the outer sheet or web 8 along one of itsmarginal edges as at 32 and the paste may also be applied by the same applicator I5 in a strip along its medial portion as at 33. As the sheets are brought into direct contact between the roller l0 and the guide pulley H, a portion of the paste as applied to the web 8 is transferred by adherence to one face of the liner sheet H in strips along one of its marginal edges as at 32 and transversely thereof as at 33 where the paste isliner sheet or web II from the roll 1 passes over the guide rolls 41 mounted at each end ,and supported by a floating frame 48 and from the guide rollers carried by this floating frame, the web ll passes over the guide roll 48 whereat it meets with the outer sheet or web of paper 8. The two sheets or webs of paper 8 and H then travel in unison from the guide roller 46 to a guide roller 43 and from this guide roller 49, the two sheets or webs are separated from one another. The liner sheet H, after leaving the guide roller 49, passes over the guide rollers 50, 5| and 52, whereas, the outer web 8 travels over a guide roller 53 where it again meets and contacts with the liner web, and from there the two webs travel to the bag forming machine. Before the two contacting webs 8 and II enter the bag forming sheet to be brought into contact with the opposite edge thereof. The marginal edge 36 of the outer web 8 is folded over and tucked under the marginal edge 31 having the strip 32 of adhesive applied thereto and through the conventional heat sealing means of the bag machine, the marginal edges of each web of paper are sealed or united by localized interfusion of the adhesive, without the latter coming in direct contact with the heat applying rolls or other adapters, thereby forming two unattached telescopic tubes.

These tubes are then drawn to the breaker arm or cutting blade of the bag machine where they are cut into bag lengths, forming flaps at the opposite ends of each bag length. The tail flap 38, as is formed at one end of each bag length, forms the bottom of the bag by folding the same in the manner as shown in Fig. 10 of the drawings. As a row of slots 30- registers with each tail flap 38, the adhesive that has been squeezed or exuded through these slots 30 may be brought into direct contact with the outer face of the web 8 and be sealed or united thereto in the usual manner by localized interfusion of the adhesive. In this manner, the two formed tubes are connected together and the bottom of the bag formed, The flap 39 formed at the opposite or opened end of each bag length does not have slots in the liner sheet thereof registering therewith unless it is desired to have a sealable flap, but these fiaps39 facilitate the opening of the formed bags.

The attachment, as illustrated in Figs: 4, 5 and 6 of the drawings, may be applied to a bag machine known to the trade as a .Potdevin machine, which comprises a frame 4| having supported thereon a former 42 and the wire dividing fingers 43. This attachment consists of a supporting frame 44 having removably mounted thereupon the roll of paper 5, from which the outer tube or section of the bag is formed and also the second roll of paper I, from which the inner or liner tube or section of the bag is formed. The web or sheet of paper'B, as it leaves the roll 6, first passes over a guide roll 45 supported by the frame 44 and then to a guide roll 46. The

machine, their marginal edges are retained in spaced relation or separated by means of the wire dividing fingers 43 and from here, the two webs are jointly formed into separate tubes.

Pivotally supported as at 54 upon the frame of th attachment is a paste pot 55 having a roller or disc 56 mounted therein for supplying the paste or other adhesive used from the paste pot 55 to one face of the outer web 8. An adjustable cam 51 is provided for raising and lowering the paste pot 55 whereby the paste applying disc 56 may be moved in and out of contact with the web 8 as the latter passes over the roller 53. As the face of the web 8 having the paste applied thereto comes in contact with one face of the web II, a portion of the paste is transferred to one face of the web II as the two webs pass from the roller 53 until they are separated by the wire dividing fingers 43, whereupon, each web will .have paste applied alon one marginal edge of each sheet or web so that during the formation of the bag structure, the edges of each web may be sealed or united together and also paste may be applied transversely of the webs at points where the ends of the formed tubes are to be connected together when forming the bag bottoms.

When forming a single ply or walled bag, the liner web ll may be dispensed with and in doing so, the roll of paper 7, as well as its carriage, may be folded back against the framework of the attachment. consists of a frame 58 pivotally supported at one end as at 59 to the frame 44 of the attachment and the outer end of this frame 58 is supported by the movable leg or bar 60. By removing this bar 60 from contact with the frame 44 of the attachment, the carriage may be permitted to drop and fold back against the frame 44.

Supported within the floating frame 48 is a stationary shaft 5| having detachably connected thereto a cylinder 62 and in the upper face of this cylinder there is formed a plurality of transverse- 1y extending slots 63. This cylinder 62, together with its slots 63, cooperates with the teeth 64 formed with the rotatable cutting blade 65. This cutting blade 65 is detachably and adjustably connected by means of the slot and bolt connections 65 to a rotating shaft 61, which latter is journalled within suitable bearings mounted The carriage. for the liner roll 'I' in order that the teeth 64 of the rotary cutting blade may perforate the liner sheet II at predetermined points as the liner sheet passes over the cylinder 82 and such perforations registering with the tail flaps so formed by the breaker mechanism, which flaps provide a bottom for a bag. The floating frame 48 rests upon an ad- I justable cam 68 whereby the cylinder 62 maybe raised and lowered for regulating the linear lengths of the perforations or notches formedin the liner web or sheet I I.

As the webs 8 and H leave the roller 83, the inner face of' the web II is in direct contact with the outer face of the web 3, whereby the paste as applied to the web 8 is transferred to the inner or bottom side of the liner sheet II. The paste is applied to the outer sheet by means of the disc 58 along one of its marginal edges, as shown in Fig. 7, and indicated by the numeral 32, and also applied to the outer face of the web I in a transverse strip adjacent its medial portion, as indicated by the numeral 33. A portion of this paste as applied to the points 32 and 33 upon the outer sheet will, while-the two sheets are in direct contact, be transferred to one marginal edge of the liner sheet and the paste as applied in the strips designated by the numeral 33 will not only adhere to the inner face of the linersheet but will be squeezed or exuded through the perforations 30 formed therein by the rotary cutdrives the conventional type of pull-in roller, the adjustment of said variable speed mechanism causing the pull-in roller to pull more or less paper in proportion to the bag breaker mechanism or cutting blade. The only change necessary to properly proportion the length of the slots or tears 30 which have been created within the liner sheet, when changing the length of the bag, is to vary the depth of penetration of the teeth 83 into the liner web by adjusting the cam 69, which causes the slots to assume proper longitudinal proportions to that of the bag length.

The liner sheet I I passes over the stationary cylinder 32 at a rate of speed equal to that of the linear speed' of the tube passing through the bag machine and in providing perforations 30 in the tail flaps of bags of short lengths, the cylinder 82 is lowered by means of the cam 69, whereby the teeth 84 of the rotary knife are permitted to only ting blade 85. From this arrangement, it will be apparent that only one paste stream is required as if paste is first applied to one sheet and as both sheets are brought into direct contact with one another, the unpasted sheet will be sultably pasted by adherence through contact with the previously pasted sheet. The marginal edges of the sheets or webs are then separated by means of the fingers 43 of the bag forming machine,

as both sheets are subsequently folded, a longitudinal seal is establishedv along the marginal slightly enter the slots 63, whereas. when increasing the lengths of the bags, the cylinder is raised to positions whereat the teeth 34 are permitted to more deeply penetrate the slots 63. The greater the length of the bags being formed, the greater the speed of the bag machine and the linear speed of the paper webs and tubes formed therefrom. Therefore, when bags of short lengths are being made, the teeth 84 should be permitted to engage the liner sheet only for limited periods of time,

but when raising the cylinder 82, the teeth 64 are permitted to engage the liner sheet for a longer period of time, permitting slots 30 to be formed of the same length in liner sheets of bags of various sizes.

The number ofslots 30 cut in the sheet is dependent .upon the number of teeth 64 formed with the blade 65 and as this latter is detachably connected to the shaft 81, blades having varying numbers of teeth may be substituted therefor, whereby sheets may be perforated according to therpartieular width of the bag being formed.

edges of both the inner and outer tubes or sections of the bag but leaving the inner section unattached to the outer section along such longi-' tudinal seams.

As the two superimposed webs or sheets pass through the former oi the bag forming ma- As the teeth 64 of the rotary cutter are broughtin contact with the liner sheet II, the latter is torn or slotted at predetermined intervals and the severed portions 3! of the liner sheet are folded or bent back thereupon. The liner web ll travels over the stationary cylinder 82, which latter brings the liner sheetin contact with the rotary knife 65 but the contact of.the web with the cutting knife is effected only for a period of time suflicient to effect slots or tears 30 of lengths having the proper longitudinal proportions with that of the bottom or tail flap 38. -The rotating blade 65 is so timed that proper relation is thereby established with the breaker mechanism or cutting blade that cuts the web into separate bags. The regulation of the length of the bag is made by means of a variable speed mechanism. that From these simple adjustments, it is apparent that sheets or webs of paper may be prepared prior to fcrmingbags of various lengths and widths.

Instead of applying the transversely extending strip 33 of paste upon the inner face of the web 8, a strip 40 of paste may be applied to the outer wall of each formed bag. This strip 40 of ad hesive is applied by the regular paste bars of the bag machine, as indicated by dotted lines in Fig. 7, after the-bag tube is formed, sealed along its'longitudinal seam and severed from the web.

' After the paste is applied as illustrated in Fig. 7,

the tall flap 38 of the bag is then folded over, bringing the perforations 30 of the liner sheet in register with the paste strip 40, which latter flows through the perforations and causes a seal to be effected between the bag proper, inner-liner and outer-liner sheets, thereby closing the bottom of the bag and connecting the bag tubes together;

From the foregoing, it is obvious that my attachments may be easily and readily connected to any of the well known paper bag making machines i'or feeding a single sheet of paper thereto when the paper rolls 1 are removed, or they may be employed in the forming of duplex bags where two separate tubes are required and yet the bottoms ofeither type oi bag will require only one strip of adhesive for eifecting a seal between the tail flap and the body of the bag. This latter strip of adhesive extending entirely across the width of the bag establishes a more effective and economical sealing means. Purthermore, by perforating the liner sheet, only one sealing operation needs to be effected at the bottom of each bag, whereupon, both tubes of the bags may be jointly united or sealed together and yet permitting the remaining portions of the tubes to be unattached.

Manifestly, the construction herein shown is capable of considerable modification and such modifications as come within the scope of my claims, I consider within the spirit of my invention.

1. The method of manufacturing duplex bags formed from an outer sheet and a liner sheet of paper, which consists in applying an adhesive at points upon one of said sheets where the same is to be united, bringing said sheets into contact with one another whereby a portion of the adhesive so applied to one sheet will be transferred to the other of said sheets, separating said sheets at points where the adhesive is applied, forming saidsheets into a telescopic tube, sealing the marginal edges of each sheet toggher with the adhesive'applied thereto to form separate and unattached tubes, cutting said tubes in bag lengths and sealing one end of each bag length whereby the tubular sections thereof will be com nected together.

2, The method of forming duplex bags from two webs of continuously advancing material which comprises the steps of applying adhesive strips from a single paste stream upon one face of said webs, causing said webs to be brought into direct contact whereby a part of the adhesive applied to one web will be deposited in corresponding strips upon the other of said webs, separating said webs at points where the adhesive is applied, forming said webs into separate and telescopically arranged tubes, cutting said tubes into bag lengths and jointly connecting together one end of each tube of said bag lengths.

3. The method of manufacturing duplex bags from webs of continuously advancing material which comprises the steps of forming rows of. perforations at certain predetermined points along one of said-webs, applying paste in strips upon one ofsaid webs, arranging said webs in superimposed relation and forcing the same in direct contact whereby the strips of paste applied to one web will be transferred to the other of said webs, and squeezed through said perforations, separating the marginal edges of said webs, forming said webs into a tube whereby the separated marginal edges of each web will overlap one another and may be connected together by the adhesive applied thereto, cutting said tube in bag lengths, folding over one end of each bag along one of said webs, applying paste in strips.

upon one of said webs, arranging said webs in superimposed relation and forcing the same in directcontact whereby the strips of past 'applied to one web will be transferred to the other of said webs and squeezed through said perforations, separating the marginal dges of said webs,

'folding over and tucking in the opposite marginal edges of each web, uniting the marginal edges of each web by the adhesive applied thereto whereby two unattached and telescopically arranged tubes are formed, cutting said tubes into bag lengths and forming at one end of each bag length a tail flap, a row of said perforations in one of said webs registering with each tail flap, folding over the tail flap of each bag length whereby the adhesive exuding through said row of perforations registering therewith will contact an outer wall of the bag length for uniting the tail flap to the latter by the adhesive applied thereto.

LOUIE C. KIMPLE. 

